Perl Requires Chilkat v11.1.0+

Regular Expression with Multiple Matches and Capture Groups

See more Regular Expressions Examples

Demonstrates a regular expression with multiple matches and capture groups for each match.

Note: Chilkat uses PCRE2. See PCRE2 Regular Expressions
Also see: PCRE2 Performance

Perl

use chilkat();

$success = 0;

$pattern = "Name:\\s+(\\w+)\\s+(\\w+),\\s+Email:\\s+(\\S+)";

$sb = chilkat::CkStringBuilder->new();
$crlf = 1;
$sb->AppendLine('Name: John Smith, Email: john.smith@example.com',$crlf);
$sb->AppendLine('Name: Jack Johnson, Email: jack.johnson@example.com',$crlf);
$sb->AppendLine('Name: Mary Adams, Email: mary.adams@example.com',$crlf);

print $sb->getAsString() . "\r\n";

#  We have the following string:
#  Name: John Smith, Email: john.smith@example.com
#  Name: Jack Johnson, Email: jack.johnson@example.com
#  Name: Mary Adams, Email: mary.adams@example.com

$json = chilkat::CkJsonObject->new();
$json->put_EmitCompact(0);

$timeoutMs = 2000;
$numMatches = $sb->RegexMatch($pattern,$json,$timeoutMs);
if ($numMatches < 0) {
    #  Probably an error in the regular expression.
    #  Suggestion: Use AI to help create and/or diagnose regular expressions.
    print $sb->lastErrorText() . "\r\n";
    exit;
}

#  Examine the matches:
print $json->emit() . "\r\n";

#  This is the JSON with the match information.
#  See the JSON parsing code below to get the matched capture group values.

#  {
#    "match": [
#      {
#        "group": [
#          {
#            "cap": "Name: John Smith, Email: john.smith@example.com",
#            "idx": 0,
#            "len": 47
#          },
#          {
#            "cap": "John",
#            "idx": 6,
#            "len": 4
#          },
#          {
#            "cap": "Smith",
#            "idx": 11,
#            "len": 5
#          },
#          {
#            "cap": "john.smith@example.com",
#            "idx": 25,
#            "len": 22
#          }
#        ]
#      },
#      {
#        "group": [
#          {
#            "cap": "Name: Jack Johnson, Email: jack.johnson@example.com",
#            "idx": 49,
#            "len": 51
#          },
#          {
#            "cap": "Jack",
#            "idx": 55,
#            "len": 4
#          },
#          {
#            "cap": "Johnson",
#            "idx": 60,
#            "len": 7
#          },
#          {
#            "cap": "jack.johnson@example.com",
#            "idx": 76,
#            "len": 24
#          }
#        ]
#      },
#      {
#        "group": [
#          {
#            "cap": "Name: Mary Adams, Email: mary.adams@example.com",
#            "idx": 102,
#            "len": 47
#          },
#          {
#            "cap": "Mary",
#            "idx": 108,
#            "len": 4
#          },
#          {
#            "cap": "Adams",
#            "idx": 113,
#            "len": 5
#          },
#          {
#            "cap": "mary.adams@example.com",
#            "idx": 127,
#            "len": 22
#          }
#        ]
#      }
#    ]
#  }

#  Important:  Capture group 0 always contains the entire match — that is, the portion of the input string that matches the full regular expression.

$i = 0;
$matchCount = $json->SizeOfArray("match");
while ($i < $matchCount) {
    print "Match " . ($i + 1) . ":" . "\r\n";
    $json->put_I($i);
    $j = 0;
    $numCaptureGroups = $json->SizeOfArray("match[i].group");
    while ($j < $numCaptureGroups) {
        $json->put_J($j);
        $cap = $json->stringOf("match[i].group[j].cap");
        print $j . ": " . $cap . "\r\n";
        $j = $j + 1;
    }

    $i = $i + 1;
}

#  Capture group 0 always contains the entire match — that is, the portion of the input string that matches the full regular expression.

#  Output

#  Match 1:
#  0: Name: John Smith, Email: john.smith@example.com
#  1: John
#  2: Smith
#  3: john.smith@example.com
#  Match 2:
#  0: Name: Jack Johnson, Email: jack.johnson@example.com
#  1: Jack
#  2: Johnson
#  3: jack.johnson@example.com
#  Match 3:
#  0: Name: Mary Adams, Email: mary.adams@example.com
#  1: Mary
#  2: Adams
#  3: mary.adams@example.com